/*
 * Copyright ©2021 su binglun(9085309@qq.com). All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *---------------------------------------------------------------------
 *-                                                                   -
 *-           Website : http://phoenix.sunny360.cn/                   -
 *-                                                                   -
 *---------------------------------------------------------------------
 */
package cn.sunny360.core.common;

import cn.sunny360.core.utils.PathMatcher;
import io.vertx.core.Promise;
import io.vertx.core.impl.logging.Logger;
import io.vertx.core.impl.logging.LoggerFactory;
import io.vertx.ext.web.RoutingContext;

import java.util.ArrayList;
import java.util.List;

/**
 * 拦截器执行链
 * @author sublun
 */
public class RouterInterceptorChain {

    private static Logger logger = LoggerFactory.getLogger(RouterInterceptorChain.class);

    private List<RouterInterceptor> interceptors;

    private PathMatcher pathMatcher = PathMatcher.pathMatcher();

    RouterInterceptorChain(){
        interceptors = new ArrayList<>();
    }
    public static RouterInterceptorChain createNew(){
        return new RouterInterceptorChain();
    }

    public RouterInterceptorChain add(String regPath, RouterInterceptor interceptor) {
        interceptor.setMatchPath(regPath);
        if (!interceptors.isEmpty()) {
            RouterInterceptor front = interceptors.get(interceptors.size() - 1);
            front.setNext(interceptor);
        }
        interceptors.add(interceptor);
        return this;
    }

    public Promise<PhResult> handle(RoutingContext context) {
        Promise<PhResult> result = Promise.promise();
        if (interceptors.isEmpty()) {
            result.complete(PhResult.ok());
        } else {
            RouterInterceptor interceptor = interceptors.get(0);
            exec(interceptor, context, result);
        }

        return result;
    }

    private void exec(RouterInterceptor interceptor, RoutingContext context, Promise<PhResult> result) {
        //取url
        String path = context.request().path();
        if (pathMatcher.match(interceptor.getMatchPath(), path)) {
            Promise<PhResult> promise = interceptor.handle(context);
            promise.future()
                    .onSuccess(h -> {
                        if (!interceptor.hasNext()) {
                            result.complete(PhResult.ok());
                        } else {
                            if (h.getCode() == 200) {
                                exec(interceptor.next(), context, result);
                            } else {
                                result.complete(h);
                            }
                        }
                    })
                    .onFailure(result::fail);
        } else {
            if (!interceptor.hasNext()) {
                result.complete(PhResult.ok());
            } else {
                exec(interceptor.next(), context, result);
            }
        }
    }

}
